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| (R) MH88615 ONS Subscriber Line Interface Circuit Advance Information Features * * ONS SLIC Variants - 1 Germany - 3 UK - 7 North America * * * * * * * * Transformerless 2W to 4W conversion Battery Feed to line Off-Hook and dial pulse detection Tip and Ring ground over-current protection Power Denial Integral Ringing Amplifier Programmable Loop Current Wide V BAT Operating Range ISSUE 1 April 1995 Ordering Information MH88615-1 MH88615-3 MH88615-7 20 Pin SIL Package 20 Pin SIL Package 20 Pin SIL Package 0C to 70C Description The Mitel MH88615 ONS SLIC provides a complete interface between a switching system and a subscriber loop. The functions provided by the MH88615 include battery feed and integral ringing amplifier feed to the subscriber line, 2W to 4W conversion current feed, off-hook and dial pulse detection. The device is fabricated as a thick film hybrid in a 20 pin single-in-line package. Applications Line Interface for * PABX * * * * * Pair Gain Systems Satellite Communication Systems Key Telephone Systems Marine Systems Cordless Local Loop PD VBat DCRI RV Power Denial Ringing Control RC TIP RING Tip & Ring Drivers 2-Wire to 4-Wire Conversion VR VX VRef Constant Current Feed Loop Supervision CAP SHK Figure 1 - Block Diagram 2-139 MH88615 TIP RING NC DCRI LPGND VBat NC VDD AGND VEE RC PD NC SHK VR VRef CAP VX NC RV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Advance Information Figure 2 - Pin Description Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Name TIP RING NC DCRI LPGND VBat NC VDD AGND VEE RC PD NC SHK VR VRef CAP Description Tip Lead. Connects to the "Tip" lead of subscriber line. Ring Lead. Connects to the "Ring" lead of subsriber line. No Connection. This pin may be used for internal connections. DC Ringing Voltage Input. A continuous 120 Vdc is applied to this pin. This voltage is the positive supply rail for the internal ringing amplifier for subscriber line. Battery Ground. VBat return path for subscriber line. Connects to the systems's energy dumping ground. Battery Voltage. Battery supply feed for subscriber line. Typically -48Vdc is applied to this pin. No Connection. This pin may be used for internal connections. Positive Supply Voltage. +5V dc supply rail. Analogue Ground. VDD and VEE return path. Negative Supply Voltage. -5V dc supply rail. Ringing Control. This input enables the ringing voltage feed to Tip and Ring for subscriber line. Power Denial. A logic high will isolate the battery voltage for Tip and Ring. No Connection. This pin may be used for internal connections. Switch Hook Detect. A logic high indicates when subscriber line has gone off-hook. Receive Signal. This is the 4 wire analogue signal received at subscriber's set. Reference Voltage. A dc reference voltage is applied to this pin to set the constant current feed to subscriber line. This pin may also be grounded for normal 25mA loop current. Ring Trip Filter Capacitor. A capacitor is normally connected from this pin to ground and filters out low frequency ringing signals, preventing false off-hook conditions. Transmit Signal. This is the 4 wire analogue signal transmitted from subscriber's set. No Connection. This pin may be used for internal connections. Ringing Voltage. 1.5 Vrms signal is injected to this pin. 18 19 20 VX NC RV 2-140 Advance Information Functional Description The Mitel MH88615 ONS SLIC provides a complete interface between a switching system and a subscriber loop. The functions provided by the MH88615 include battery feed and integral ringing amplifier feed to the subscriber line, 2W to 4W conversion, constant current feed, off-hook and dial pulse detection. The device is fabricated as a thick film hybrid in a 20 pin single-in-line package. The MH88615 is intended for applications where low cost and basic functionality is important. The MH88615 features an integral ringing amplifier which enables a system designer to provide typically 60 Vrms ringing without having to generate a high voltage, high current ac signal. The SLIC uses a transformerless 2-4 wire converter which can be connected to a CODEC to interface the 2 wire subscriber loop to a TDM (time division multiplex) PCM (pulse code modulation) digital link. Powering of the subscriber line is provided though precision battery feed resistors on the hybrid. The thick film hybrid circuit also contains control, signalling and status circuits which combine to provide a complete functional solution. A power denial facility is provided which isolates the Battery Feed from Tip and Ring. The MH88615 is designed to meet German regulatory approvals, UK regulatory approvals (BS6305), and capable of meeting the approvals for the USA (FCC Part 68/EIA 464). MH88615 Power Denial A logic high voltage applied to the power denial input effectively removes the battery voltage from the loop driver circuitry. The resulting loop current is negligible and power consumption is minimised. The power denial function is useful for disabling a loop which may have a ground fault. The SLIC is capable of detecting and indicating offhook and unbalanced conditions as well as inhibiting ringing while in power denial. Input and Network Impedance The Input and Network Balance Impedances are defined by the variant type on the MH88615. MH88615-1Germany Zin = 220 + (820//115nF) Znet = 220 +(820//115nF) MH88615-3 UK Zin = 370 + (620//310nF) Znet = 300 + (1000//220nF) MH88615-7 North America Zin = 600 Znet = 350 (1k//210nF) Ringing Amplifier The MH88615 incorporates an integral ringing amplifier. A nominal 1.5Vrms ac signal is applied to the RV pin and this produces a ringing signal of typically 60 Vrms. This should ensure that the SLIC can support a REN of 5. Constant Current Feed The loop current is programmed by the dc reference voltage applied to VRef. Switch Hook Detection When the dc current exceeds an internal threshold level, the switch hook output (SHK) will go high. If the loop resistance is so high that V Bat can no longer supply the required loop current, the output SHK will go low. This indicates that the loop resistance is too high and the line is on hook. Transmit Gain Transmit gain (Tip-Ring to Vx) is fixed at 0.dB. A dcbias on the ac input signal does not effect the ringing signal. Receive Gain Receive Gain (VR to TIP-RING) is fixed at 0dB. For correct gain, the SLIC input impedance must match the line impedance DC Loop Current Limit Under Tip or Ring ground conditions the loop current is nominally limited to 42mA. 2-141 MH88615 Absolute Maximum Ratings*- Voltages are with respect to AGND. Parameter 1 Supply Voltages Symbol VBat VDD VEE VDCRI TS Min 0.3 -0.3 0.3 -0.3 -55 Max 65 6 -6 140 125 Units V V V V C Advance Information Comments With respect LPGND With respect LPGND 2 Storage Temperature * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Characteristics 1 Supply Voltages Sym VBat VDD VEE VDCRI TOP VR FR Min -20 4.75 -4.75 0 0 Typ* -48 5.0 -5.0 48 20 60 17 Max -60 5.25 -5.25 130 70 90 68 Units V V V V C VBAT= -48V VRMS Hz Comments 2 3 Operating Temperature AC Ring Generator Voltage Frequency * Typical figures are at 25C with nominal +5V supplied and are for design aid only. DC Electrical Characteristics* Characteristics 1 Sym IDD Min Typ Max 10 5 2.5 150 1700 Units mA mA mA mW mW mA Test Comments Supply Current IEE IBat 2 3 4 5 PD on Standyby Active V Ref = AGND Power Consumption Constant Current Line Feed Adjustable Loop Current Range Maximum Operating Loop Resistance PC ILoop ILoop RLoop 23 18 1200 25 27 30 mA VBat=-48V @ ILoop=18mA, RLoop=includes telephone set Active High Logic 6 7 Ring Ground Over-Current Off-Hook Detect Output Low Voltage Output High Voltage Off-Hook Detect Output Low Current Output High Current RC, PD Control Input Input Low Voltage Input High Voltage RC, PD Control Input Input Low Current Input High Voltage VOL VOH 42 0.4 2.7 4 -400 0.7 2.0 -500 500 mA V V mA A Active High Logic V V A A 8 IOL IOH VOL VOH IIL IIH 9 10 * -48V and are for design aid only 2-142 Advance Information AC Electrical Characteristics* Characteristics 1 MH88615 Sym VR FR Min 17 100 47 -0.25 -0.15 100 10 0 0 0.25 0.15 Typ 38 68 Max Units Vrms Hz ms k Test Comments Superimposed on VBat= -48V. RV=1.5 Vrms Ringing voltage 2 3 4 5 6 Ring Trip Detect Time Input Impedance at VR Output Impedance at Vx Gain 2-wire to Vx Frequency Response 2-wire to Vx dB dB Relative to 1kHz 300Hz to 3.4 kHz 7 8 9 10 11 12 Gain Vr to 2-wire Frequency Response Vr to 2-wire Total Harmonic Distortion Common Mode Rejection Ratio Idle Channel Noise Power Supply Rejection Ratio at 2Wire or VX THD CMRR Nc PSRR -0.25 -0.15 0 0 0.25 0.15 0.5 dB dB % dB dBrnC dB Ripple 0.1V 1kHz @ VDD Relative to 1kHz 300 Hz to 3.4 kHz 50 12 25 * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Typical figures are at 25C and are for design aid only. Note 1: All of the above test conditions use a test source impedance which matches the device's impedance. Note 2: THD is measured with "A Weight" filter. AC Electrical Characteristics*- MH88615-1 Characteristics 1 2 Sym REN RL Min 5 20 24 20 24 32 54 Typ Max Units Test Comments 1 REN= 8000 @ 25 Hz Ringer Equivalence Return Loss dB dB dB dB 200 Hz - 500 Hz 500 Hz - 2.5 kHz 2.5kHz - 3.4 kHz 300 Hz - 3.4 kHz 50 Hz - 300 Hz 300 Hz - 4 kHz 3 4 Transhybrid Loss Longitudinal to Metallic Balance THL dB dB * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Note: Return Loss reference impedance are defined by variant type. Transhybrid Loss is measured when terminated with network impedance. AC Electrical Characteristics*- MH88615-3 Characteristics 1 2 3 4 Sym REN RL THL Min 4 20 20 52 Typ Max Units Test Comments 4 REN= 2200 @ 25 Hz Ringer Equivalence Return Loss Transhybrid Loss Longitudinal to Metallic Balance dB dB 300 Hz - 3.4 kHz 300 Hz - 3.4 kHz 300 Hz - 3.4 kHz dB * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Note: Return Loss reference impedance are defined by variant type. Transhybrid Loss is measured when terminated with network impedance. 2-143 MH88615 AC Electrical Characteristics*- MH88615-7 Characteristics 1 2 3 4 Advance Information Sym REN RL THL Min 5 24 20 52 Typ Max Units Test Comments 1 REN= 5000 @ 30 Hz Ringer Equivalence Return Loss Transhybrid Loss Longitudinal to Metallic Balance dB dB 300 Hz - 3.4 kHz 300 Hz - 3.4 kHz 300 Hz - 3.4 kHz dB * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Note: Return Loss reference impedance are defined by variant type. Transhybrid Loss is measured when terminated with network impedance. Side View 0.25 Max (6.4 Max) 0.29 Max (7.4 Max) 2.1 Max. (106.7 Max.) 0.750 Max. (19.0 Max.) 123 4 19 20 0.010 + 0.005 (0.25 + 0.13) 0.12 Max * Notes: 1) Not to scale 2) Dimensions in inches). 3) (Dimensions in millimetres). *Dimensions to centre of pin & tolerance non accumulative. 0.05 + 0.02 (1.3 + 0.5) * 0.180 + 0.02 (4.6 + 0.5) 0.05 + 0.020 (1.25 + 0.5) 0.020 + 0.005 (0.5 + 0.13) 0.100 + 0.010 (2.54 + 0.25) Figure 3 - Mechanical Data 2-144 |
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